      [:Distribution_Size (:DistributionSize distribution)]
      [:Distribution_Format (:DistributionFormat distribution)]
      [:Fees (:Fees distribution)]]))
+
 (defn- create-related-urls
   "Creates a SERF Related URL element from a UMM-S Document"
   [s]

            [cmr.umm-spec.xml-to-umm-mappings.serf :as utx]
            [cmr.umm-spec.util :refer [without-default-value-of not-provided]]
            [clojure.set :as set]
            [clojure.string :as str]))

(def serf-xml-namespaces

    [:Related_URL [:URL_Content_Type 
                   [:Type (:Type (:ContentType related-url))]
                   [:Subtype (:Subtype (:ContentType related-url))]]
     (for [url (:URLs related-url)]
       [:URL url])
     [:Description (:Description related-url)]]))

